package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(urlPatterns = "/*",filterName = "loginCheckFilter")
@Slf4j
public class LoginCheckFilter implements Filter {
    private static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest)servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取本次请求的URI
        String currentUri = request.getRequestURI();
        //定义不需要处理的路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"

        };

        //判断本次请求, 是否需要处理
        //如果不需要处理,直接放行
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, currentUri);
            if (match) {
                filterChain.doFilter(request,response);
                return;
            }
        }

        //4-1判断登录状态,如果已登录,则放行
        if (request.getSession().getAttribute("employee")!=null){

            Long empId = (Long)request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);


//            long id = Thread.currentThread().getId();
//            log.info("线程id为:{}",id);

            filterChain.doFilter(request,response);
            return;
        }

        //4-2、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }
        //如果未登录,则返回未登录结果,通过输出流的方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

    }
}
